Lightning, electrical wiring, and arson are among the three top causes of church fires and are also the most destructive. See info4u.us/ChurchFires.pdf for an interesting article on this subject.
According to US Fire Administration data, 65% of churches that reported fires had no smoke alarms. The fact is that smoke alarms are virtually useless in dealing with lightning and electrical fires and not very effective for arson reporting. So, what should you do to protect your church?
First you need to DETECT AND REPORT electrical failure, then to detect and report unauthorized entry, and finally detect and report smoke in attics and the upper levels of steeples.